I am not completely sure, but I think it might be B, Migration out of a stage 3 or 4 country is higher than migration to it.
D. high and low levels of silica in the different type of lava.
Explanation:
The volcanoes have different types of explosions. Some tend to be highly explosive, some less explosive, some don't have explosions at all, while some have combinations of different eruptions. The reason for this diversity in the eruption types is mostly the composition of the magma, or rather how high is the silica content in it.
Basically, the higher the silica level in the magma the higher the explosiveness, and the lower the silica level the lower the chances of explosiveness. This is the case because the higher amount of silica makes the magma thicker, so the gasses are trapped and they explode, while when the lower silica content makes the magma less thick, so the gasses are not trapped and explosions are lacking.
Answer:
I believe the answer is C but i could be wrong
Answer:
The answer is below
Explanation:
By indicating that the challenges in studying environmental science have a lot of activities ranging from one area of study to another, and it requires vast knowledge, expertise, and an experimental approach which comes with its merits and demerits to our immediate environment but at the same time helps us to understand it, anticipate, predicts and prepare a definite solution to whatever needs that may arise.
